BOISE, Idaho (AP) -- Boise fire and hazardous materials officials say crews have contained what appears to be an oily substance that was leaking into the Boise river.

Officials also say they have managed to block most of the substance from flowing downstream using booms.

Boise police spokeswoman Lynn Hightower says the oil was coming from a storm drain under the Americana bridge and the sheen on the water goes downstream for about a mile. But officials still don't know the source of the leak.

The sheen on the river was reported by a citizen Wednesday afternoon.

Hightower says officials do not know exactly what type of petroleum product is leaking and it is not known how much of it is in the river.

Copyright 2010 The AP.

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